Channel Selection and Coordination in Dual-Channel Supply Chains

This paper investigates the influence of channel structures and channel coordination on the supplier, the retailer, and the entire supply chain in the context of two single-channel and two dual-channel supply chains. We extensively study two Pareto zone concepts: channel-adding Pareto zone and contract-implementing Pareto zone. In the channel-adding Pareto zone, both the supplier and the retailer benefit from adding a new channel to the traditional single-channel supply chain. In the contract-implementing Pareto zone, it is mutually beneficial for the supplier and the retailer to utilize the proposed contract coordination policy. The analysis suggests the preference lists of the supplier and the retailer over channel structures with and without coordination are different, and depend on parameters like channel base demand, channel operational costs, and channel substitutability.     

On composite lognormal-Pareto models

Recently, Cooray & Ananda (2005) proposed a composite lognormal-Pareto model for use with loss payments data of the sort arising in the actuarial and insurance industries. Their model is based on a lognormal density up to an unknown threshold value and a two-parameter Pareto density thereafter. Here we identify and discuss limitations of this composite lognormal-Pareto model which are likely to severely curtail its potential for practical application to real world data sets. In addition, we present two different composite models based on lognormal and Pareto models in order to address these concerns. The performance of all three composite models is discussed and compared in the context of an example based upon a well-known fire insurance data set.     

基于帕累托改进理论视阙下的校企融合思考

目前,高职院校在与企业进行校企合作的过程中,越来越容易产生合作深度、合作边界难以把握的问题。双方在利益着眼点上的差异加剧了这一问题的严重性。为妥善处理这一困难,校企业合作的双方都有必要采用帕累托改进理论来达到交换、生产(教学)和产品混合最优,从而提高校企作的水平与质量。     

基于供应风险水平的我国水产品供应链优化模型研究

水产品供应链风险分为市场供需风险、合作风险、供应链结构风险、质量风险和信息风险。本文通过对整个水产品供应网络存在的风险进行分析,以降低供应风险从而最终达到整个水产品供应链优化为目标,利用两阶段优化模型论证了如何选择供应商和决策购买量,并以上海市某水产品批发市场为研究对象进行了实证分析。分析表明,两阶段优化模型在一定程度上为水产品供应链风险度量提供了新的方法,丰富和完善了水产品供应风险管理理论。     

关于提高库存管理水平的思考—以岳进煤矿器材供应站为例

以岳进煤矿器材供应站为例,结合库存控制系统及该煤矿的实际特点,就其库存管理现状进行分析并找出存在的问题,进而从库存管理模式设计、加强物资需求计划管理以及仓储物资管理、完善物资信息管理系统等方面提出提高其库存管理水平的相应策略。     

Optimum allocation in multivariate stratified random sampling: stochastic matrix mathematical programming

The allocation problem for multivariate stratified random sampling as a problem of stochastic matrix integer mathematical programming is considered, minimizing the estimated covariance matrix of estimated means subject to fixed cost or fixed total sample size. With these aims the asymptotic normality of sample covariance matrices for each strata is established. Some alternative approaches are suggested for its solution. An example is solved by applying the proposed techniques.     

帕累托法则在仓库盘点中的应用

帕累托法则是数理统计中的一种重要方法,文中通过对仓库盘点进行分析,介绍了如何根据帕累托法则进行仓库盘点及补充措施。     

基于帕累托最优的京津冀旅游企业合作路径选择

区域旅游企业合作已经成为提高区域旅游的竞争力,是改善区域旅游总体形象,实施区域旅游业持续、健康、快速发展的重要途径之一。现阶段,京津冀旅游企业合作有集团化和战略联盟两种模式。但因在合作中不能实现帕累托最优或改进,造成了京津冀旅游企业合作限于行政区域内合作和远距离合作为主,区域之间的合作结构松散,不能实现规模效应和范围经济。因此,政府在旅游企业因收益差距太大而不愿合作时,应该给予足够的政策引导及利益补偿机制,企业本身应对合作模式慎重选择,并建立合理的公司治理结构,共同推进合作创新,最终实现京津冀区域旅游业的可持续发展。     

深基坑双排桩支护结构优化设计

建立了多设计准则,多约束条件的面向桩－土相互作用的双排桩支护结构优化设计模型,给出了模型与结构分析软件及优化算法软件相结合的优化设计方法。完成了高层建筑深基坑双排桩支护实例的优化设计,并分析了桩身刚度、桩的直径和前后排桩距对优化结果的影响,算例结果表明,本文提出的优化模型应用于双排桩支护结构设计将带来显著的经济效益。